Sewing machine



Dec; l0, 1929. VfG. sAuRMAN 1,738,672

" SEWING MAcHINE Filed sept. 6.A 192? Patented Dec. 1f), 1929 vieren Gre-.E swarm,

or OAKLAND, CALIFORNIA i env/1Ne- MACHINE 'ApplicationV filed september 'The invention Affoinling the subject matter of this application relates to sewing machines. iThe principal object of the invention is to provide aldevicejfor preventing the stopping 5 ofthe electric motor of a sewing machine at aftiine When-theseivingneedleis in engagein'ientgvvith the material tohe stitched.

.Another object ofthe invention' is to provide a device fonsewing machines which conioftrolsthe electric motorof said machine so that everytime beforethefmovement of the sewing needle ceases said needle is Withdrawn from-the material to be stitched.

A still further object of kthe invention is to prov-ide adevicefor;controlling the-electric motor oi a sewinginacliinesaid device tobe automatically' operatedr inI cgi-'relation 1with the needle-*actuating mechanism. y y K Another object of this invention is to pro 2') -vide an auxiliarycircuit hrealierfojr controlling the electric-meten of a'setving machine, said circuit breakerto antoinatisally; ac* tuatedby theneedle actuating means of said machine and to cooperate' Withithemain switch ct, said machine, saiddevice'vto-loe simple in construction, convenient lof arrangement and comparatively inexpensive.

`The .auxiliary cirouitrbrealrer andthe actuating devicenthereofgis so .constructed as 3o to he readily attachable to any kind of electric .sewing .machine Without, necessitating materialalteration'thereon.

=lVitlitlie foregoing andother objects-in View, my .invention resides in the combination and arrangement o't'partsand in thedetails of .construction hereinafter .described and claimed. The invention isclearly illustrated in the accompanying drawing.. part .of the sp eciiication and -ini'vhicln 40 A Figure l is a side view of a sewing machine, the vcasing thereofbeing. partly broken away,

so asto disclose the ,circuit breaker. and theV circuit breaker actuating mechanism,

{figure-Q, isa sectional view of thedevice taken along' the line 2 2 ci Figure l, and Figure 3'is a 'Wiring-.diagram ofthe device. y In carrying 4out my invention,` I rmalte use of the operating mechanism Of a standard type of sewingr machine, having a vcasing l inclosing the operating mechanism driven by the bar d.

6;*1927.. serial No. 217,629.

an Aelectric motor-:2. A needle 3 is clamped in any conventional manner not' shown to a in :the casing lnsually at agreatspeed for piercing the material tobe stitched. {Saidv kmaterial is placed upon a flatsteel plate andmechanism 'is securedt'o, the; end of theV .drivg5 i ing shaft. 6` for reciprocatingthecasing-in Y 'llhistiansmission mechanism-is i ojl di-.'erentV construction in sevvingmaghines of different makeb-ut anyconvefntional move- .nient transmitting `rmechanism not shoWni Will 70 readily Cooperate Widmer device wbehere* inafter described. An eccentric cam is {dis- `posedon the shaft Q and israised and lowered according cothe rotation 'of saidshaft The eccentric n cam 7 ,clauses the; leverg Sitol move 75 slightly upwardly'andggdoyvnwardly `and at the timeI-tovturn aroundgthe ,pivotpin 9, said pin being secured to the Wall vofi-thev casingl. Arslotl() in the intermediate p0rktionof the lever Svperinits theverticalfslid- 30 ing ofthe lever 8 `onthe-pin9`g'but lsaid slot .l0 does not provide suiiicient space for lateral movement of said levertliereon. y'llhepivoting of the lever 8 around the pin 9 canses` the rocking; ci a cam '11 adjacent', to fthe end .e5

of the lever and. disposed' fonia .holebin s haljft 12. yThe', b obloin shaft 12 Iacti?.ates in. turn the feeding linechanism and the .'.ieed/l. dogy 5. 'y IThe rogclnnoxoi the b obhinshaft 11s transinitted toa feed -shaft 1 3 bymeansof levers 9,0

and Y. 15, .pivotally secured l tot .each I other.: at- 16. The 'lever .lis rocked ljythehohbiin shaft l2 and `in .turn itcauses theleverfl to oscillate, thelatter beingi segcuredto theffeed' .Shaffilrrnfd rockstheeaine; [Ail frnis securedlto the; feed shaft .13l in euch. a' relation as to actuate an auxiliary circnit breakerl in "a manner towbehereinaiter descri ed. y,

The auxiliary circuit'breaker "18 compris-s a'braclret'l) secured to the'casing of thesewing machine. An insulating block 2() is supported on said bracket, resilient contacts 21 1 and 22 are carried in said insulating block 20.

in connection with sewing machines.

The arm 17 isV so disposed that when rocked Y it engages the resilient contact 21 and presses the same toward the opposite resilient contact 22, thereby completing the circuit through saidcontacts. IVhen the arm 17 is rocked in the opposite direction to the one heretofore described the pressure on vthe resilient contact- 21 isV released and the circuit between said con-v,

tacts is automatically interrupted.

A two way switch 23 is provided to control the circuit of the electric motor 2. The two way switch 23 maybe constructed m any conventional manner adapted to be used rI`he "terminals 24 and 25 thereof are alternately contacted by a switch arm 26, said arm to be secured to an operating shaft 27 and .to befinsulated therefrom. A terminal 28 i .onxsaid arm 26 is connected to the source cuit of the electric motor 2 while the termivto nal 24 is connected into the electrical circuit of the auxiliary'V circuit ,breakerY 18. wA spring 30, secured on one end thereof to the Vleverarm 29 and at the other end'thereof tothe casing of the switch23, holds the Hlever arm 29 in a position so' that in the Uff position of the switch the arm 26 thereof is inV engagement with the `terminal 24. f Y

Y The wiring diagram in Figure 3 clearly "illustrates the cooperation between the two way switch 23, the auxiliary switch and they electric motor 2. When the switch 23 is Vrin the Off positionfsho'wn in Figure 1 the switch arm 26 thereof is pressed against the terminal 24. The source of the electromotive force is indicated in thev diagram as beingafbattery 31, but it is understood that'rany sourcevof electric current may be used in connection with my device. Y In most 'cases' the lever arm 26 is connected tothe electric lightcircuit of a building.

sistance unit 32 vis indicated in the wiring Vdiagram for transforming the current to the required voltage. TheV sewing machine is started by exerting a pressure on the arm 29 soa-.1. to move the samelagainst the tension vof the springf30 thereby turning the switch arm 26 and bringing the same into Contact' with the terminal 25iin the posit-ion shown `in dotted line in the wiring diagram. The

switch arm 26 is now held in position and in v f Contact with the terminal by the continuous pressure on t-he lever `arm 29 so that theV current is directly connectedthere- VVthroughtoV the electric motor 2 .driving the sewing machine.

A "re-r In the sewing machines used at present when the pressure on the lever arm 29 is released the flow of the electric current is immediately interrupted and the motor l is stopped regardless of the position of the needle 3 relative to the material to be stitched. It is a very common* occurrence that the electric motor stops at a time when the needle 3 is Ynot yet withdrawn from thev material, and it is found to be necessary to' manually turn the motor until the needle is withdrawn. y

Iny my device the arm 29 is automatically brought back to the starting position by the spring immediately after the pressure thereon is released and the switch armA 26 is brought thereby into contact with the terminal 24. As shownin the full line position thereofin the wiring diagram the current is connected from the source ofthe electric motive force 31 throughthe resistance 32, through `the switch arm 26 and terminal 24 to the resilient terminal 22 o f the auxiliary switch 18. Now the arm 17 is so adjusted on the feed shaft 13 that when the needle 3 is piercing the material to be stitched said arm presses the contact 21 against the contact 22 thereby closing the circuit through the circuit breaker 18. It is apparent thereyfore from the wiring diagram that when the needle V3`is piercing the material and the larm 17 closes the circuit breaker contact 21 to the contact 22, the electric current'continues to flow throughthe switchy arm 26,

the contact 24 and through the circuitv breaker 18 to the electric motor 2 rotating said motor until the needle 3 is withdrawn `from the material to be stitched. The rocking of the feed shaft 13 is infinely adjusted Y coaction with the vertical movement of thek needle bar 4 by means of the lever 8; therefore when the needle 3 is withdrawn from the material the feed shaft 13 is rocked in the opposite direction so as to bring the arm 17 out of engagement with the contact plate 21 thereby instantaneously breaking the circuit of the electric motor 2. It is evident thatbyv properly adjusting the arm 17 on thel `rocking feedshaft13 the circuit of the electricmotor is disconnected only at a time when the needle 3 is completely withdrawn 'from the material, thereby eliminating the necessity of manual'turning of the motor 2.

on, such as cams and levers, in all make of sewing machines for rockin g'the feed shaft 13 in proper coactionl withvthemovement ofthe needle bar 4. The lever arm '17 maybe readil;7 adjustedfand installed on the feed shaft of lany standard sewing machine. The auX- iliary switch 18V and the arm'17 maybe also installed to any other rocking part ofthe sewing mechanism, in which the rocking of said particular part is adjusted to coact withthe movement of the needle bar 4. It is also to be noted that the simple two way switch 23 is shown only for the purpose of illustration but any two way switch adapted for use on sewing machines may be also readily adapted to cooperate with the auxiliary circuit breaker 18. It is to be understood that changes `may be made within the domain of mere form of construction or arrangement by persons skilled in the art Without involving any change of mode of operation or extension or result described in the appended claims.

Having thus described my invention what l new claim as novel and desire to secure by Letters Patent is l. In an electric motor driven sewing machinehaving a needle thereon actuated by said motor to pierce a. material; and means driven by said motor in co-relation to the position of said needle to feed the material; a main electric circuit to control the motor; an auxiliary electric circuit actuated by said feeding mechanism for controlling the motor at the material engaging position of the needle; and means to render said auxiliary` circuit operative, when the main circuit is dis-A connected.

2. In an electric motor driven sewing machine having a needle thereon actuated by said motor to piercer a material; a two way switch connected one way to the motor; an

auxiliary circuit breaker connected in series between the other Way of said switch and the motor; means on said two way switch to automatically close the circuit to said auxiliary circuit vbreaker after breaking the motor circuit; and rocking means for closing the auxiliary circuit breaker when the needle is in engagement with said material. i

3. In an electric motor driven sewing machine having a needle thereon actuated by*` said motor to pierce a material, and means driven by the motor 1n co-relation to the posiated by said feeding mechanism to close thev auxiliary circuit breaker when* the needle is in engagement with said material.

e. In a sewing machine having electric driving means therefor and a needle actuated by said means to pierce a material; a main electric circuit, an auxiliary electric circuitv connected to the main electric circuit; an auxiliary circuit breaker in the auxiliary circuitv adapted to be automatically actuated in syn- Vsaid material.

chronismA with theneedle actuating mechan nism so as to be closed when the'needlef is in engagement with the material; andmeans for disconnecting the auxiliary circuitfrom the motor and connecting the motor to the main circuit, and also for automatically connecting the motor tothe auxiliary circuit upon the breaking of the main circuit connection.y

i 5. In a sewing machine having electric driving means therefor and a needle actuated by said means to pierce a material, al main electric circuit, a circuit breaker adapted to connect the driving means to the main circuit and to automaticallyl connect the .driving cally connect the driving means to the auxiliaryy circuit ywhen i disconnecting the lmotor from Vthe main circuit; an auxiliaryv circuit breaker in the auxiliary circuit; and means to ,close the said auxiliary circuit-breaker when the needle` is in engagement with the '7.1 In a lsewing machine having 'electric drivingmeans'therefor and a needle actuated by said means kto pierce a materi al,`a main Aelectric circuit, an auxiliary velectric circuit,

a circuit breaker adapted to Aconnect thedriving means to the main Vcircuit and to` automatically connect the driving means to the auxiliary circuit when 'disconnecting the motor yfrom the main circuit; an auxiliary circuit breaker in the auxiliary circuit; and means vrocked by the drivingmeans in synchronism with the movement of the needle so as to close the said auxiliary/circuit breaker when the needle 'is in engagement with the saidl material. f

8. VIn a sewing machine having electric driving means therefor, a needle moved by said means, and a feeding mechanism moved by said driving means in co-relation to said needle; a main electric circuit, an auxiliary electric circuit, a circuit breaker adapted to connect the driving means to the main circuit and to automatically connect the driving means to the auxiliary circuit when disconnecting the motor from the main circuit; an auxiliary circuit breaker in said auxiliary circuit; and means actuated by said feeding mechanism for closing'said auxiliary circuit breaker when the needle is in engagement with the material.

ino y llO " y7,9.,Iny al serving :machine havingelectric ,driving means thereforand -a needle moved `by said means, van electriccircuit, an auxiliary electric circuit.; ya circuit breakenxmeans in said `circuit breaker for-breaking and makingithe' connectionV between the `driving means andthe firs'tcircuiu `and for ccnnecting'rsaid driving means into the auxiliary circuit after the breaking of the main circuit connection; andzrocking means forclosingsaid1auXil--l iarycircuitv breaker wlienithe needle ris/i engagement with the saidmaterial.

10; In an electric motor driven sewingmachine'ivhaving a `needlethereoriv actuated by v said motor; an electric circuit for the motor, a two'wayecircuit breaker, one Way-'connecting said motor in'to said circuit,van auxiliary circuitbreakerconnected between the 'other 'Way-of, said circuit breaker andthe motor; zu said-circuit breaker beingadapted to connect-the =auxiliary rcircuit breaker into the circuit, when the first connection to the-motor is open; andV rocking fineans for'closing the auxiliary circuit-'breaker When A'the needle isina'seWingposition. flLln an electric motor driven sewing machine having fa needle thereon actuated by'eaid motor, anv electric circuit for the motor, aftwo Way'circuitf-breakem one .Way connecting ysaidv motor. into-*said circuit, an auxiliaryy circuit breaker connectedbetvveeri the other Way ofsa'id circuit breaker and the motor ;l? means related to said'circuitbieaker to'automatically'connect the auxiliary-cinr '.5 cuit breaker into the said electric circuit when the first connection tothe motorv is opened; and rocking` means for closing-the auxiliary circuit breaker Vwhen the; needleV is Y inisewingposition.` Y 4G yIn testimony vvhereof'IV aiix mvsignature,

Y f VICTOR:GEORGEl Vsir'liiuuitia. 

